@rosemarya, in California hospitals cannot except lab orders from out of state unfortunately and our local neph prefers Quest because he can easily access. Not crazy about Quest because they have poor customer service and the labs can be delayed up to 2 or more weeks, due to customer load. Also the gluecose lab/A1C labs they run are not accurate they tend to run low. One of the transplant neph said it would be impossible for a non diabetic to acheive, let alone a diabetic! Personally I prefer to go to hospital/UCLA but these places will not accept out of state lab orders!
You are very fortunate to be able do the monthly Prograf kit checks by mail. Mayo Az does not do any post txplant mail order due to patient load I was told.